same domain different url same database with different wordpress theme

Hello,

My wordpress site https://www.delreymd.com/ear-nose-throat-ENT-los-angeles.
I want mobile site for this site when i open this site in mobile device same database should be applyed but different theme and my mobile url should be https://www.delreymd.com/ear-nose-throat-ENT-los-angeles/mobile.

Help me how can i do this.

Thanks in advanced.